Dial Tone Generator (CB5984E)

This circuit is from an old documentation making use of a 3,579,645 MHz analog color television crystal. The audio amplifier supports the equivalent.

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Light Linear Meter (CB5304S)
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This circuit was found in an old American magazine and could make use of more modern components...
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Figure bellow shows how the 4510 can be cascaded for counts higher than 10. The circuit shows the...